package com.kamistoat.meimeistore.commoncore.domain;

import com.kamistoat.meimeistore.commoncore.constant.Constants;

import java.io.Serializable;

/**
 * 自定义响应体R类。
 * 是一个普通的类，内部有三个属性
 */
public class R<T> implements Serializable {
    private static final long serialVersionUID = 1L;

    // 两个public的状态码
    public static final int SUCCESS = Constants.SUCCESS;
    public static final int FAIL = Constants.FAIL;

    // 三个private的内部属性。一般自定义响应体都是这三个类 -- 状态码/信息/数据
    private int code;
    private String msg;
    private T data;

    /**
     * 类似构造方法的内部方法
     *
     * @param data
     * @param code
     * @param msg
     * @param <T>
     * @return
     */
    private static <T> R<T> restResult(T data, int code, String msg) {
        R<T> apiResult = new R<>();
        apiResult.setCode(code);
        apiResult.setData(data);
        apiResult.setMsg(msg);
        return apiResult;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    // 状态预设。注意全部都是静态方法。调用时直接使用 R元类

    /**
     * OK状态预设
     *
     * @param <T>
     * @return
     */
    public static <T> R<T> ok() {
        return restResult(null, SUCCESS, null);
    }

    public static <T> R<T> ok(T data) {
        return restResult(data, SUCCESS, null);
    }

    public static <T> R<T> ok(T data, String msg) {
        return restResult(data, SUCCESS, msg);
    }

    /**
     * fail状态预设
     *
     * @param <T>
     * @return
     */
    public static <T> R<T> fail() {
        return restResult(null, FAIL, null);
    }

    public static <T> R<T> fail(String msg) {
        return restResult(null, FAIL, msg);
    }

    public static <T> R<T> fail(T data) {
        return restResult(data, FAIL, null);
    }

    public static <T> R<T> fail(T data, String msg) {
        return restResult(data, FAIL, msg);
    }

    public static <T> R<T> fail(int code, String msg) {
        return restResult(null, code, msg);
    }


}
